Pacific Fusion
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Mechanical Design
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About Pacific Fusion
Pacific Fusion was founded in 2023 with the mission to power the world with abundant, affordable, clean energy.
We are rapidly designing and building a pulser-driven inertial fusion system to achieve net facility gain (more fusion energy output than stored energy input). In parallel, we are developing the key components required to build affordable fusion systems.
Our plans are ambitious. We have raised over $900M so far from incredible investors, resourcing us to deliver on these plans. We are bringing together the best scientists, engineers, and operators from the fusion community, hard tech industry, and other sectors. We are united by a shared sense of urgency to provide clean power for the world, particularly managing climate change while meeting growing global energy demand. You can read more about us in this letter from our founders.
Why This Role Matters
Pacific Fusion is seeking an exceptional Senior Mechanical Design Engineer to join our dynamic team and create the path to commercial fusion energy. Based in Fremont, CA, Pacific is building multiple pulsed power-based drivers from the ground up. You will lead the design, development, and validation of mechanical components and systems integral to our advanced pulsed magnetic inertial fusion energy systems. The primary focus of this role will be converting engineering models into high-fidelity 3D renders and technical animations.
What You'll Do
- Develop innovative mechanical designs for complex engineering problems while adhering to ambitious timelines.
- Maintain internal technical documentation and visual assembly guides within the company repository.
- Lead the end-to-end development process, taking conceptual whiteboard sketches through to fully realized, production-ready mechanical products
- Coordinate with multidisciplinary teams (including electrical, software, and manufacturing engineers) to integrate system-level designs
- Create 3D renders and technical animations using Creo data for internal design reviews.
- Transform raw engineering models into high-fidelity visual assets for executive-level decision-making.
- Identify potential mechanical interference or assembly challenges using high-resolution visual simulations.
What You Bring.
- Dedicated work experience in mechanical design
- Advanced proficiency in CAD packages as well as Blender/Render
- Portfolio of work demonstrating high-end technical rendering
- Ability to present complex mechanical concepts clearly through visual storytelling
Total Compensation & Benefits for Eligible Employees
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Industry-competitive salary
-
Equity plan
-
6% employer 401k matching
-
Generous paid time off (including sick leave, vacation, paid family leave)
-
Medical, Dental, and Vision insurance
Actual base salary offered will be determined by: experience, skills, and work location. This range is for base salary, our total compensation includes equity and benefits. We welcome you to apply even if your expectations are outside our listed range.
Pacific Fusion is committed to creating a diverse environment and is proud to be an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.
Pacific Fusion is committed to providing reasonable accommodations for qualified individuals with disabilities in our job application procedures and throughout employment. If you need assistance or any accommodation, please let us know.
Pacific Fusion does not accept unsolicited resumes from recruiters or employment agencies without a fully executed recruitment agreement in place. In the absence of such agreement, Pacific Fusion reserves the right to pursue and hire any candidates without an obligation to pay fees. Agencies are requested not to contact Pacific Fusion hiring managers or employees regarding recruiting services.
Ready to apply?
Apply to Pacific Fusion
Senior Mechanical Engineer - Fluid Systems
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About Pacific Fusion
Pacific Fusion was founded in 2023 with the mission to power the world with abundant, affordable, clean energy.
We are rapidly designing and building a pulser-driven inertial fusion system to achieve net facility gain (more fusion energy output than stored energy input). In parallel, we are developing the key components required to build affordable fusion systems.
Our plans are ambitious. We have raised over $900M so far from incredible investors, resourcing us to deliver on these plans. We are bringing together the best scientists, engineers, and operators from the fusion community, hard tech industry, and other sectors. We are united by a shared sense of urgency to provide clean power for the world, particularly managing climate change while meeting growing global energy demand. You can read more about us in this letter from our founders.
Why This Role Matters
Pacific Fusion is seeking an exceptional Senior Mechanical Engineer – Fluid Systems to help create the path to commercial fusion energy. You will take ownership of fluid system development and deployment in support of our demonstration system, solving multidisciplinary engineering problems necessary for proving net-facility gain using pulsed magnetic inertial fusion. This role reports to the Senior Process Engineer in Pulser Engineering and sits at the intersection of fluid systems design, thermal management, and hands-on hardware integration. You will work onsite at our Fremont, CA office, with periodic collaboration at our San Leandro, CA Build Center.
What you'll do
- Take full ownership of fluid system designs — including thermal and structural subsystem considerations — continuously refining design specifications to meet evolving system requirements.
- Develop novel hardware solutions by leveraging historical engineering knowledge and first-principles thinking, and validate these solutions through rigorous testing.
- Design fluid system hardware and process engineering tools (ePLAN), conducting detailed analysis with specialized in-house and external tools
- Lead designs from concept through fabrication and test, building and testing assemblies in our Fremont Research High Bay and San Leandro Build Center.
- Coordinate with multidisciplinary teams — including electrical, software, manufacturing, and pulser engineering — to deliver integrated system-level designs.
- Work closely with experienced technicians to implement and integrate hardware designs hands-on.
- Conduct and participate in design reviews, utilizing feedback to achieve fully functional, production-ready systems.
- Address and resolve hardware development issues that arise on integrated fluid system components.
- Oversee the creation of detailed design documentation, drawings, and specifications for fluid systems.
What you bring
- Bachelor's degree in Mechanical Engineering or a related engineering discipline; Master's or PhD is a plus.
- 7+ years of professional experience delivering on full-scope engineering projects, including schedule ownership.
- Experience applying engineering first-principles and method-based thinking to challenging problems.
- Hands-on exposure across multiple engineering disciplines, including fluids, mechanical, structural, and thermal.
- Proficiency in CAD software (Creo Parametric preferred) and strong 3D modeling habits.
- Experience with analytical tools such as MATLAB, Simulink Simscape, ANSYS Fluent, or equivalent.
- Proven track record of taking mechanical designs from concept through fabrication and test.
- Hands-on experience in laboratory or prototype environments — comfortable with rapid iteration and ambiguity.
- Excellent written and verbal communication skills, including the ability to communicate trade-offs clearly across disciplines.
Bonus Points
- Experience in fusion, plasma physics, accelerator physics, defense, or other high-consequence technical environments.
- Familiarity with process engineering tools such as ePLAN.
- Exposure to large-scale thermal management systems, coolant loops, or industrial fluid handling.
- Experience with vacuum systems, cryogenics, high-voltage hardware, or pulsed power components.
Total Compensation & Benefits for Eligible Employees
-
Industry-competitive salary
-
Equity plan
-
6% employer 401k matching
-
Generous paid time off (including sick leave, vacation, paid family leave)
-
Medical, Dental, and Vision insurance
Actual base salary offered will be determined by: experience, skills, and work location. This range is for base salary, our total compensation includes equity and benefits. We welcome you to apply even if your expectations are outside our listed range.
Pacific Fusion is committed to creating a diverse environment and is proud to be an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.
Pacific Fusion is committed to providing reasonable accommodations for qualified individuals with disabilities in our job application procedures and throughout employment. If you need assistance or any accommodation, please let us know.
Pacific Fusion does not accept unsolicited resumes from recruiters or employment agencies without a fully executed recruitment agreement in place. In the absence of such agreement, Pacific Fusion reserves the right to pursue and hire any candidates without an obligation to pay fees. Agencies are requested not to contact Pacific Fusion hiring managers or employees regarding recruiting services.
Ready to apply?
Apply to Pacific Fusion
Senior Engineer - Steel Structures
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About Pacific Fusion
Pacific Fusion was founded in 2023 with the mission to power the world with abundant, affordable, clean energy.
We are rapidly designing and building a pulser-driven inertial fusion system to achieve net facility gain (more fusion energy output than stored energy input). In parallel, we are developing the key components required to build affordable fusion systems.
Our plans are ambitious. We have raised over $900M so far from incredible investors, resourcing us to deliver on these plans. We are bringing together the best scientists, engineers, and operators from the fusion community, hard tech industry, and other sectors. We are united by a shared sense of urgency to provide clean power for the world, particularly managing climate change while meeting growing global energy demand. You can read more about us in this letter from our founders.
Why This Role Matters
Pacific Fusion is seeking an exceptional Senior Mechanical Engineer to join our dynamic team and create the path to commercial fusion energy. You will lead the design, detailed structural analysis, integration, and validation of large structures, and systems integral to our advanced fusion energy systems. This role requires a top-tier combination of technical expertise, problem-solving skills, and a proactive mindset to meet the exciting challenges in the field of fusion energy. As a Senior Mechanical Engineer, you will lead collaborative and challenging projects, mentor junior engineers, and play a vital role in driving the overall development effort
What You'll Do
- Conduct detailed design, structural analysis, and calculations for steel structures integral to our fusion demonstration system. Develop solutions that prioritize integrity, manufacturability, modularity, and durability.
- Optimize and “future-proof” critical steel hardware for cost, weight, and longevity.
- Analyze existing designs and provide recommendations for greater load-bearing capabilities, efficiency, cost savings
- Conduct design reviews and provide critical feedback to improve system performance and reliability.
- Coordinate with multidisciplinary teams (including electrical, manufacturing, and construction teams) to integrate system-level designs.
- Oversee the creation of detailed design documentation and specifications and ensure compliance with industry standards and codes.
- Conduct risk assessments and develop sound mitigation strategies.
What You Bring
- Bachelor’s Degree in Mechanical Engineering required. A Master’s Degree or PhD is a plus.
- Advanced knowledge of designing and building large structures
- 5+ years work experience as a Mechanical Engineer.
- Advanced knowledge of CAD software, such as Creo.
- Experience in the application of Finite Element Analysis (FEA).
- Proven track record of developing and launching successful mechanical designs.
- Excellent leadership skills, with the ability to mentor and guide junior engineers.
- Strong understanding of manufacturing processes and DFM (Design for Manufacturability).
- Excellent problem-solving skills, with a strong attention to detail.
- Experience in hands-on engineering design, rapid iteration, and creative problem solving in a laboratory setting.
- Excellent written and verbal communication skills.
Total Compensation & Benefits for Eligible Employees
-
Industry-competitive salary
-
Equity plan
-
6% employer 401k matching
-
Generous paid time off (including sick leave, vacation, paid family leave)
-
Medical, Dental, and Vision insurance
Actual base salary offered will be determined by: experience, skills, and work location. This range is for base salary, our total compensation includes equity and benefits. We welcome you to apply even if your expectations are outside our listed range.
Pacific Fusion is committed to creating a diverse environment and is proud to be an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.
Pacific Fusion is committed to providing reasonable accommodations for qualified individuals with disabilities in our job application procedures and throughout employment. If you need assistance or any accommodation, please let us know.
Pacific Fusion does not accept unsolicited resumes from recruiters or employment agencies without a fully executed recruitment agreement in place. In the absence of such agreement, Pacific Fusion reserves the right to pursue and hire any candidates without an obligation to pay fees. Agencies are requested not to contact Pacific Fusion hiring managers or employees regarding recruiting services.
Ready to apply?
Apply to Pacific Fusion